I agree with this, except you cant quite dismiss Hawkings' work like that. It stands on its own, independent of the surrounding celebutant hoopla.There are quite a few people who are using science to attain some sort of celebrity status. They have tendency of writing books and appearing in TV shows that are more appealing from the perspective of science fiction and therefor tend to draw a large audience who otherwise may not be interested in science. I would even put Hawking in that category. However, disrespecting guys like Edward Witten just because your religion compels you to do so is very sad.
Let us talk about serious science now - particularly string theory as that appears to be the topic of this thread. Both theory of relativity and quantum field theory have established themselves as well accepted theories that are supported by evidence. However, there is a gap between the two. As we know, theory of relativity is good at explaining things at large distances and speeds nearing that of light but it sucks at explaining things at quantum level. That is where quantum field theory comes into play. This leaves a gap between the two. That gap needs to be filled. This is where string theory comes in. String theory postulates that everything in our universe and I mean everything such as energy, matter, gravity, etc. is made of one dimensional vibrating string. Prior to string theory which came out in 1980s, our understanding was that quarks were the most basic building block. Prior to arrival of Edward Witten on the scene, there were five competing string theories. This was problem for the credibility of the theory. But in 1995, Edward Witten successfully demonstrated that all those five theories were simply special cases of one string theory which was called M-theory. M stands for membrane. Prior to M-theory, string theory postulated that our realities existed in 10 dimensions. M-theory adds one more dimension to this bringing the total dimensions to 11. So our universe is made of three dimensional membrane which is made of one dimensional vibrating string. There is no limit to these membranes aka universes. When we think of multiverse, we tend to think of multiple universes at vast distances. That is not always the case actually. There could be a membrane right next to you but you cannot reach it even if it is right next to you because it could be at a higher dimension than yours. So it is not the distance which is always separating us from other membranes (universes) but the dimensions as well. We are nothing but the prisoners to the dimensions in which we exist. For example, us humans are limited to four dimensions. But even today we know of particles that defy common sense. For example, bosons can exist in multiple places at the same time. Positrons can go back in time. Last but not least the curious behaviors of entangled particles seem crazy.
The same of kind of disrespect that some people are showing towards string theory and its contributors was shown towards Satyendra Nath Bose (Indian theoretical physicist) when he in 1920 proposed that there is a possibility of a particle which can exist in two places at the same time. This was a revolutionary idea as it violated Pauli's Exclusion Principle. He received a lot of ridicule for his idea till Einstein backed him. Now bosons are reality. No body disputes that.
You have reasons to be skeptical about M-theory. There is nothing wrong with that skepticism. However, you have to realize that science is about proposing ideas and deliberating on them. That is how we advance as a society.
Keep in mind, it may be hard for us to prove M-theory for now but with the advent of next generation particle smashers, we may be able to pickup on signatures of gravitons which is a prediction of M-theory (string theory).